On 30.06.2015 20:28, Andrei Borzenkov wrote:
> В Tue, 30 Jun 2015 15:05:46 -0300
> Paulo Flabiano Smorigo <pfsmor...@linux.vnet.ibm.com> пишет:
>
>> On 2015-06-30 11:33, Vladimir 'phcoder' Serbinenko wrote:
>>> What about clang?
>>
>> Not good news about clang support. This is what the toolchain team said
>> about it:
>>
>> The -mbig-endian option was added around April 10th, 2014.
>> Unfortunately, those who implemented it only implemented it for ARM and
>> one other architecture.
>>
>> The option is currently accepted on Power systems, but does not have any
>> affect on the code generation for Power.
>>
>>
>> So, what can we do here? Maybe add a constrain in the configure file
>> saying that it's not possible to build GRUB in a LE environment using clang.
>
> If I understand it correctly, it is possible to build for big-endian
> PowerPC using
>
> clang -target=powerpc
>
@pfsmorigo. Please try attached patch
> but then we depend on clang being built with BE target support; and
> e.g. openSUSE builds it with
>
> cmake -G "Ninja" \
> -DBUILD_SHARED_LIBS=OFF \
> -DCMAKE_BUILD_TYPE=Release \
> -DLLVM_ENABLE_ASSERTIONS=OFF \
> -DLLVM_TARGETS_TO_BUILD=host \
> -DCMAKE_C_FLAGS="-O0" \
> -DCMAKE_CXX_FLAGS="-O0" \
> -DLLVM_HOST_TRIPLE=%{host_triple} \
>
> so as I understand on ppc64le it does not build support for any other
> target. Actually openSUSE does not even build clang on ppc at all.
>
>
>
>>>
>>> Le 30 juin 2015 16:30, "Andrei Borzenkov" <arvidj...@gmail.com
>>> <mailto:arvidj...@gmail.com>> a écrit :
>>>
>>> On Tue, Jun 30, 2015 at 5:03 PM, Vladimir 'phcoder' Serbinenko
>>> <phco...@gmail.com <mailto:phco...@gmail.com>> wrote:
>>> > Which compilers support these flags? I'm concerned of breaking
>>> old compilers
>>> >
>>>
>>> -static and -mbig-endian are listed in gcc 2.95.3 documentation for PPC.
>>>
>>> > Le 30 juin 2015 14:57, "Paulo Flabiano Smorigo"
>>> > <pfsmor...@linux.vnet.ibm.com
>>> <mailto:pfsmor...@linux.vnet.ibm.com>> a écrit :
>>> >>
>>> >> libgcc dependency was removed *just* for this target because
>>> >> the distros that use ppc64el doesn't have 32-bit support on it.
>>> >>
>>> >> * configure.ac <http://configure.ac>: Add targets for
>>> powerpc64el and skip libgcc.
>>> >> * Makefile.am: Likewise.
>>> >> ---
>>> >> configure.ac <http://configure.ac> | 8 ++++++++
>>> >> 1 file changed, 8 insertions(+)
>>> >>
>>> >> diff --git a/configure.ac <http://configure.ac> b/configure.ac
>>> <http://configure.ac>
>>> >> index fd8a62e..0a79fad 100644
>>> >> --- a/configure.ac <http://configure.ac>
>>> >> +++ b/configure.ac <http://configure.ac>
>>> >> @@ -116,6 +116,7 @@ if test "x$with_platform" = x; then
>>> >> x86_64-*) platform=pc ;;
>>> >> powerpc-*) platform=ieee1275 ;;
>>> >> powerpc64-*) platform=ieee1275 ;;
>>> >> + powerpc64le-*) platform=ieee1275 ;;
>>> >> sparc64-*) platform=ieee1275 ;;
>>> >> mipsel-*) platform=loongson ;;
>>> >> mips-*) platform=arc ;;
>>> >> @@ -138,6 +139,7 @@ case "$target_cpu"-"$platform" in
>>> >> x86_64-none) ;;
>>> >> x86_64-*) target_cpu=i386 ;;
>>> >> powerpc64-ieee1275) target_cpu=powerpc ;;
>>> >> + powerpc64le-ieee1275) target_cpu=powerpc ;;
>>> >> esac
>>> >>
>>> >> # Check if the platform is supported, make final adjustments.
>>> >> @@ -601,6 +603,12 @@ if test "x$target_cpu" = xi386 && test
>>> "x$platform"
>>> >> != xemu; then
>>> >> TARGET_CFLAGS="$TARGET_CFLAGS -march=i386"
>>> >> fi
>>> >>
>>> >> +if test x$target_cpu = xpowerpc; then
>>> >> + TARGET_CFLAGS="$TARGET_CFLAGS -mbig-endian"
>>> >> + TARGET_CCASFLAGS="$TARGET_CCASFLAGS -mbig-endian"
>>> >> + TARGET_LDFLAGS="$TARGET_LDFLAGS -static -mbig-endian"
>>> >> +fi
>>> >> +
>>> >> if test "x$target_m32" = x1; then
>>> >> # Force 32-bit mode.
>>> >> TARGET_CFLAGS="$TARGET_CFLAGS -m32"
>>> >> --
>>> >> 2.1.0
>>> >>
>>> >>
>>> >> _______________________________________________
>>> >> Grub-devel mailing list
>>> >> Grub-devel@gnu.org <mailto:Grub-devel@gnu.org>
>>> >> https://lists.gnu.org/mailman/listinfo/grub-devel
>>> >
>>> >
>>> > _______________________________________________
>>> > Grub-devel mailing list
>>> > Grub-devel@gnu.org <mailto:Grub-devel@gnu.org>
>>> > https://lists.gnu.org/mailman/listinfo/grub-devel
>>> >
>>>
>>> _______________________________________________
>>> Grub-devel mailing list
>>> Grub-devel@gnu.org <mailto:Grub-devel@gnu.org>
>>> https://lists.gnu.org/mailman/listinfo/grub-devel
>>>
>>>
>>>
>>> _______________________________________________
>>> Grub-devel mailing list
>>> Grub-devel@gnu.org
>>> https://lists.gnu.org/mailman/listinfo/grub-devel
>>>
>>
>>
>
>
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel
> diff --git a/configure.ac b/configure.ac
index fd8a62e..a4ee419 100644
--- a/configure.ac
+++ b/configure.ac
@@ -116,6 +116,7 @@ if test "x$with_platform" = x; then
x86_64-*) platform=pc ;;
powerpc-*) platform=ieee1275 ;;
powerpc64-*) platform=ieee1275 ;;
+ powerpc64le-*) platform=ieee1275 ;;
sparc64-*) platform=ieee1275 ;;
mipsel-*) platform=loongson ;;
mips-*) platform=arc ;;
@@ -138,6 +139,7 @@ case "$target_cpu"-"$platform" in
x86_64-none) ;;
x86_64-*) target_cpu=i386 ;;
powerpc64-ieee1275) target_cpu=powerpc ;;
+ powerpc64le-ieee1275) target_cpu=powerpc ;;
esac
# Check if the platform is supported, make final adjustments.
@@ -601,6 +603,33 @@ if test "x$target_cpu" = xi386 && test "x$platform" != xemu; then
TARGET_CFLAGS="$TARGET_CFLAGS -march=i386"
fi
+if test x$target_cpu = xpowerpc; then
+ AC_CACHE_CHECK([for options to get big-endian compilation], grub_cv_target_cc_big_endian, [
+ grub_cv_target_cc_big_endian=no
+ for cand in "-target powerpc" \
+ "-mbig-endian"; do
+ if test x"$grub_cv_target_cc_big_endian" != xno ; then
+ break
+ fi
+ CFLAGS="$TARGET_CFLAGS $cand -Werror"
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && (__ORDER_BIG_ENDIAN__ != __BYTE_ORDER__)
+#error still little endian
+#endif
+]], [[]])],
+ [grub_cv_target_cc_big_endian="$cand"], [])
+ done
+ ])
+
+ if test x"$grub_cv_target_cc_big_endian" = xno ; then
+ AC_MSG_ERROR([could not force big-endian])
+ fi
+
+ TARGET_CFLAGS="$TARGET_CFLAGS $grub_cv_target_cc_big_endian"
+ TARGET_CCASFLAGS="$TARGET_CCASFLAGS $grub_cv_target_cc_big_endian"
+ TARGET_LDFLAGS="$TARGET_LDFLAGS -static $grub_cv_target_cc_big_endian"
+fi
+
if test "x$target_m32" = x1; then
# Force 32-bit mode.
TARGET_CFLAGS="$TARGET_CFLAGS -m32"
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